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09-23-2010, 06:59 PM | #1 |
Member
Join Date: Sep 2010
Location: Cape Fear area, North Carolina
Posts: 53
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Idle learning curve
I'm the fellow who posted "mine won't start either" and thanks to so many of you taking the time to counsel this newbie Model A'r I got her running today. Seems as though it was gas problem and possibly fuel/air thing as it took flooring the accelerator to get it to light. Once lit it runs quite smoothly but does not have a steady idle. I haven't fooled with the idle air screw (currently 1-1/2 turns out from all in), only with the idle screw on the throttle shaft. Although it appears tight I see some gas seepage at start up around the throtle shaft. This disappears as the engine warms up. Any suggestions for fine tuning the idle?
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09-23-2010, 07:10 PM | #2 |
Senior Member
Join Date: Aug 2010
Location: Huntsville, AL
Posts: 102
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Re: Idle learning curve
Not sure about smoothly idle or for that matter if you should even try to adjust it until you clean it. I use to have same issue every few months, but after I started putting Sta-Fuel (or Blue Sta-Fuel for Alcohol added fuels) in the fuel. Now it can sit all winter and starts right up. Good Luck.
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09-23-2010, 07:10 PM | #3 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Idle learning curve
How long do you crank with the choke pulled? On my car I hit the starter then pull and release the choe and it fires right off. If the engine is warm no choke is used. I turn the gas adjustment knob about a turn open when cold, and close it after a minute.
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09-23-2010, 07:27 PM | #4 |
Senior Member
Join Date: May 2010
Location: Manawatu, New Zealand
Posts: 1,416
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Re: Idle learning curve
Inlet manifold leak or throttle shaft leak will give a lumpy idle . Karl
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09-23-2010, 11:48 PM | #5 |
Senior Member
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Re: Idle learning curve
simple,
Turn in screw until the car wants to stall. Turn out the screw, counting the turns until the car wants to stall. Screw back in 1/2 the number you turned out.
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09-24-2010, 01:20 AM | #6 |
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Join Date: May 2010
Location: Oregon
Posts: 5,959
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Re: Idle learning curve
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09-24-2010, 07:04 AM | #7 |
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Join Date: May 2010
Location: Northeast Penna
Posts: 2,108
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Re: Idle learning curve
I'll second Tom's comment about careful use of the choke; it doesn't take much to flood an up-draft carb.
Starting with a stone-cold engine, I pull the hand throttle down until I see/feel the accelerator pedal move about 1/4" towards the floor. Then I open the gas knob about 1 turn, then pull the choke all the way and hold. Step on the starter. As soon as the engine fires / coughs, I release the choke knob and make sure it is all the way in. Usually, the engine fires within 3 to 5 grunts of the starter. |
09-24-2010, 11:24 AM | #8 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,959
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Re: Idle learning curve
you only need to choke for 1 or 2 revolutions at the most, otherwise you will cause flooding and wet plugs.
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09-25-2010, 08:38 AM | #9 |
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Join Date: May 2010
Location: Cincinnati, Ohio
Posts: 798
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Re: Idle learning curve
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